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NATURAL See also: gas occur-ring in petroliferous formations
.
It consists mainly of hydro-carbons of the See also: paraffin series, principally See also: marsh gas, which constitutes from 5o to 90 % of the Pennsylvanian gas
.
Members of the See also: olefine series are also See also: present, especially in the gas of See also: Baku
.
Varying amounts of See also: carbon dioxide, sometimes as much as ro% or more, and small quantities of carbon monoxide, nitrogen, hydrogen and See also: oxygen are also found
.
For particulars of the See also: geological occurrence, and the collection and distribution, of natural gas, see PETROLEUM
.
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